Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf6e04e05bbb799…

MALICIOUS

PDF

87.0 KB Created: 2021-08-09 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6c30720c8286c21e6a650e189c08873e SHA-1: 13817352f3c4ddcfeb408f65bad5f0c1e1d3f11a SHA-256: eaf6e04e05bbb799475af71fc386a84efe127e1cb76194a62f4a3b3315ca1d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=how+old+is+my+remington+11-48 PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9986f0d90---34465707144.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d6c50e9e9---68241743723.pdfIn PDF document text
    • http://megalaserasia.com/upload///sakikejumilo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/labueps4fajmbdq6a5qr3olap1/daxosojotawajonugemu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd626f1794---punelalabole.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/roxuvonoweliluf.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/buvewiwewurugejikaxi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4256b59c56---23938327786.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/pitafetasedegoragasuj.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/36eb654f0b522040532d19ba7f1eead0/jizoxuzarif.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/19715781241.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/1691213818.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/voxomasiwadinufiweja.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/16946191332.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2d244df0---rogojawasitidanuvafam.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a90776ed6---7785818625.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dcaaf635d56---giwurojusutojupumosataruw.pdfIn PDF document text
    • https://austarpharma.com/upload/files/73733631851.pdfIn PDF document text
    • https://kawanmto.net/contents//files/dokawexirupolaxigabawore.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160963692cdc1c---61778237570.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3e949f8df6e19aeca067ea674ae521f3/vujulakobivi.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2ji6mgbmt8lpum33i2uej9fb0b/97686284074.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zoviwasazesoxelaxozu.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/58951393445.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/95915047960.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/57c11bf316f3745f3ac0043acb7d1942/72064858580.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17880 bytes
SHA-256: 03bafb24f8e3e9c3882fda051ec45ad936284d1a9279b54ae772107644dff005
font_01_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 10992 bytes
SHA-256: d3f80b88f01ccb69abd64e260867b5a98485f5941cd11dcfe7f23449af7f2d96
font_02_sfnt_off0001349c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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